package cn.tedu.sp06zuul.fb;

import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class OrderFB implements FallbackProvider {
     /*
    设置针对那个后台服务进行降级
    -item-service;只针对商品服务降级
    -* 对所有服务都应用当前降级类
    -null对所有服务都应用当前降级类
     */
    @Override
    public String getRoute() {

        return "order-service";
    }
    /*
    向客户端返回的响应数据
     */
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                String json = JsonResult.build()
                        .code(500)
                        .msg("后台服务器出错,!!!!!!!!!!!!!")
                        .toString();

                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders ht= new HttpHeaders();
                ht.add("Content-Type","application/json;charset=UTF-8");
                return ht;
            }
        };
    }
}
